1. T.B. Massalski, H. Okamoto, P.R. Subramanian, L. Kacprzak, Binary Alloy Phase Diagrams, 2nd ed., Vol. 1, 1990, ASM, Materials Park, OH, 1990, p. 179.
2. Eutectic Mircostructure Evolution in a Directionally Solidified Nb-Al Alloy
3. Handbook of Ternary Alloy Phase Diagrams, 1st ed., Vol. 4, ASM, Materials Park, OH, 1995.